EightBit/LR35902/inc/Disassembler.h

#pragma once

#include <cstdint>
#include <string>
#include <sstream>
#include <boost/format.hpp>

#include "GameBoyBus.h"

namespace EightBit {

	namespace GameBoy {

		class LR35902;

		class Disassembler {
		public:
			Disassembler(Bus& bus) noexcept;

			static std::string state(LR35902& cpu);
			std::string disassemble(LR35902& cpu);

			static std::string flag(uint8_t value, int flag, std::string represents);
			static std::string flags(uint8_t value);
			static std::string hex(uint8_t value);
			static std::string hex(uint16_t value);
			static std::string binary(uint8_t value);
			static std::string decimal(uint8_t value);
			static std::string io(uint8_t value);
			static std::string interrupt(uint8_t value);

			static std::string invalid(uint8_t value);

		private:
			enum class IoRegister {
				Abbreviated,	// FF00 + dd
				Absolute,		// FFdd
				Register,		// C
				Unused,			// Unused!
			};

			Bus& m_bus;

			mutable boost::format m_formatter;
			bool m_prefixCB = false;

			void disassemble(std::ostringstream& output, LR35902& cpu, uint16_t pc);

			void disassembleCB(
				std::ostringstream& output,
				LR35902& cpu,
				uint16_t pc,
				std::string& specification,
				int& dumpCount,
				int x, int y, int z,
				int p, int q);

			void disassembleOther(
				std::ostringstream& output,
				LR35902& cpu,
				uint16_t pc,
				std::string& specification,
				int& dumpCount,
				IoRegister& ioRegister,
				int x, int y, int z,
				int p, int q);

			std::string RP(int rp) const;
			std::string RP2(int rp) const;
			std::string R(int r) const;
			static std::string cc(int flag);
			static std::string alu(int which);

			Bus& BUS() noexcept { return m_bus; }
		};
	}
}